Never let it be said that I am unhelpful. Have a list.
1, rat poison
2, any sort of poison
3, flamethrower (if you can stand the stink of burnt hair)
4, throwing them in the air to use as target practice (I have a gun, Johanna has her knives, I'm sure other people have their weapons)
5, Magic types could perhaps make them fuck off and die? Can you do that or is there some sort of unmaking rule?
6, Throw them in the lake and toss in a toaster or sixty.
7, Feed them to the dragons.
8, Arm everyone with a machete and pretend they're jungle vines.
9, Stand on them.
10, Drop them from the roof.
11, Drop things on them from a great height.
12, Hit them with hammers.
13, Freeze them to absolute zero, and then hit them with hammers.
14, Stop feeding the little fuckers.
15, Put them all in one room and seal it shut. Airtight. They'll either asphyxiate or squash themselves to death.
Feel free to add to the list.